From 1890 to 2000, the American Indian, Eskimo, and Aleut population $P$ (in thousands) can be modeled by the function $P=0.004t^3-0.24t^2+4.9t+243$ , where $t$ is the number of years since 1890. In which year did the population first reach 722,000? The population first reached 722,000 in the year .

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